package com.kylin.type2;


public class SingletonTest02 {
    public static void main(String[] args) {
        Singleton instance1 = Singleton.getInstance();
        Singleton instance2 = Singleton.getInstance();
        System.out.println(instance1 == instance2);
        System.out.println("instance1.hashCode=" + instance1.hashCode());
        System.out.println("instance2.hashCode=" + instance2.hashCode());
    }
}

//饿汉式---静态变量
class Singleton {
    //1.构造器私有化,外部不能new
    private Singleton() {

    }

    //2.本类内部创建对象实例
    private static Singleton instance;

    //在静态代码块中创建单例对象
    static {
        instance = new Singleton();
    }

    //3.提供一个公有的静态方法，返回实例对象
    public static Singleton getInstance() {
        return instance;
    }
}